#!/usr/bin/env python
"""Import the given python module(s) and report error(s) encountered."""
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type


def main():
    """
    Main program function used to isolate globals from imported code.
    Changes to globals in imported modules on Python 2.7 will overwrite our own globals.
    """
    import contextlib
    import os
    import re
    import sys
    import traceback
    import warnings

    try:
        import importlib.util
        imp = None  # pylint: disable=invalid-name
    except ImportError:
        importlib = None  # pylint: disable=invalid-name
        import imp

    try:
        from StringIO import StringIO
    except ImportError:
        from io import StringIO

    import ansible.module_utils.basic
    import ansible.module_utils.common.removed

    try:
        from ansible.utils.collection_loader import AnsibleCollectionLoader
    except ImportError:
        AnsibleCollectionLoader = None

    class ImporterAnsibleModuleException(Exception):
        """Exception thrown during initialization of ImporterAnsibleModule."""

    class ImporterAnsibleModule:
        """Replacement for AnsibleModule to support import testing."""
        def __init__(self, *args, **kwargs):
            raise ImporterAnsibleModuleException()

    # stop Ansible module execution during AnsibleModule instantiation
    ansible.module_utils.basic.AnsibleModule = ImporterAnsibleModule
    # no-op for _load_params since it may be called before instantiating AnsibleModule
    ansible.module_utils.basic._load_params = lambda *args, **kwargs: {}  # pylint: disable=protected-access
    # no-op for removed_module since it is called in place of AnsibleModule instantiation
    ansible.module_utils.common.removed.removed_module = lambda *args, **kwargs: None

    def run():
        """Main program function."""
        base_dir = os.getcwd()
        messages = set()

        if AnsibleCollectionLoader:
            # allow importing code from collections
            sys.meta_path.insert(0, AnsibleCollectionLoader())

        for path in sys.argv[1:] or sys.stdin.read().splitlines():
            test_python_module(path, base_dir, messages, False)
            test_python_module(path, base_dir, messages, True)

        if messages:
            exit(10)

    def test_python_module(path, base_dir, messages, ansible_module):
        if ansible_module:
            # importing modules with __main__ under Python 2.6 exits with status code 1
            if sys.version_info < (2, 7):
                return

            # only run __main__ protected code for Ansible modules
            if not path.startswith('lib/ansible/modules/'):
                return

            # async_wrapper is not an Ansible module
            if path == 'lib/ansible/modules/utilities/logic/async_wrapper.py':
                return

            # run code protected by __name__ conditional
            name = '__main__'
            # show the Ansible module responsible for the exception, even if it was thrown in module_utils
            filter_dir = os.path.join(base_dir, 'lib/ansible/modules')
        else:
            # do not run code protected by __name__ conditional
            name = 'module_import_test'
            # show the Ansible file responsible for the exception, even if it was thrown in 3rd party code
            filter_dir = base_dir

        capture = Capture()

        try:
            if imp:
                with open(path, 'r') as module_fd:
                    with capture_output(capture):
                        imp.load_module(name, module_fd, os.path.abspath(path), ('.py', 'r', imp.PY_SOURCE))
            else:
                spec = importlib.util.spec_from_file_location(name, os.path.abspath(path))
                module = importlib.util.module_from_spec(spec)

                with capture_output(capture):
                    spec.loader.exec_module(module)

            capture_report(path, capture, messages)
        except ImporterAnsibleModuleException:
            # module instantiated AnsibleModule without raising an exception
            pass
        # We truly want to catch anything the plugin might do here, including call sys.exit() so we
        # catch BaseException
        except BaseException as ex:  # pylint: disable=locally-disabled, broad-except
            capture_report(path, capture, messages)

            exc_type, _exc, exc_tb = sys.exc_info()
            message = str(ex)
            results = list(reversed(traceback.extract_tb(exc_tb)))
            source = None
            line = 0
            offset = 0

            if isinstance(ex, SyntaxError) and ex.filename.endswith(path):  # pylint: disable=locally-disabled, no-member
                # A SyntaxError in the source we're importing will have the correct path, line and offset.
                # However, the traceback will report the path to this importer.py script instead.
                # We'll use the details from the SyntaxError in this case, as it's more accurate.
                source = path
                line = ex.lineno or 0  # pylint: disable=locally-disabled, no-member
                offset = ex.offset or 0  # pylint: disable=locally-disabled, no-member
                message = str(ex)

                # Hack to remove the filename and line number from the message, if present.
                message = message.replace(' (%s, line %d)' % (os.path.basename(path), line), '')
            else:
                for result in results:
                    if result[0].startswith(filter_dir):
                        source = result[0][len(base_dir) + 1:].replace('test/sanity/import/', '')
                        line = result[1] or 0
                        break

                if not source:
                    # If none of our source files are found in the traceback, report the file we were testing.
                    # I haven't been able to come up with a test case that encounters this issue yet.
                    source = path
                    message += ' (in %s:%d)' % (results[-1][0], results[-1][1] or 0)

            message = re.sub(r'\n *', ': ', message)
            error = '%s:%d:%d: %s: %s' % (source, line, offset, exc_type.__name__, message)

            report_message(error, messages)

    class Capture:
        """Captured output and/or exception."""
        def __init__(self):
            self.stdout = StringIO()
            self.stderr = StringIO()
            self.warnings = []

    def capture_report(path, capture, messages):
        """Report on captured output.
        :type path: str
        :type capture: Capture
        :type messages: set[str]
        """
        if capture.stdout.getvalue():
            first = capture.stdout.getvalue().strip().splitlines()[0].strip()
            message = '%s:%d:%d: %s: %s' % (path, 0, 0, 'StandardOutputUsed', first)
            report_message(message, messages)

        if capture.stderr.getvalue():
            first = capture.stderr.getvalue().strip().splitlines()[0].strip()
            message = '%s:%d:%d: %s: %s' % (path, 0, 0, 'StandardErrorUsed', first)
            report_message(message, messages)

        for warning in capture.warnings:
            msg = re.sub(r'\s+', ' ', '%s' % warning.message).strip()

            filepath = os.path.relpath(warning.filename)
            lineno = warning.lineno

            import_dir = 'test/runner/.tox/import/'
            minimal_dir = 'test/runner/.tox/minimal-'

            if filepath.startswith('../') or filepath.startswith(minimal_dir):
                # The warning occurred outside our source tree.
                # The best we can do is to report the file which was tested that triggered the warning.
                # If the responsible import is in shared code this warning will be repeated for each file tested which imports the shared code.
                msg += ' (in %s:%d)' % (warning.filename, warning.lineno)
                filepath = path
                lineno = 0
            elif filepath.startswith(import_dir):
                # Strip the import dir from warning paths in shared code.
                # Needed when warnings occur in places like module_utils but are caught by the modules importing the module_utils.
                filepath = os.path.relpath(filepath, import_dir)

            message = '%s:%d:%d: %s: %s' % (filepath, lineno, 0, warning.category.__name__, msg)
            report_message(message, messages)

    def report_message(message, messages):
        """Report message if not already reported.
        :type message: str
        :type messages: set[str]
        """
        if message not in messages:
            messages.add(message)
            print(message)

    @contextlib.contextmanager
    def capture_output(capture):
        """Capture sys.stdout and sys.stderr.
        :type capture: Capture
        """
        old_stdout = sys.stdout
        old_stderr = sys.stderr

        sys.stdout = capture.stdout
        sys.stderr = capture.stderr

        with warnings.catch_warnings(record=True) as captured_warnings:
            try:
                yield
            finally:
                capture.warnings = captured_warnings

                sys.stdout = old_stdout
                sys.stderr = old_stderr

    run()


if __name__ == '__main__':
    main()
